Three physical, one time.
You need all four to pinpoint an event in spacetime.

But, disregarding time, you need 3 dimensions to locate a point in space, or on Earth, or in your living room. That's why all real things have a length, width and height. It is because the world we live in (space) is 3 dimensional (physically).

Three physical, one time.
You need all four to pinpoint an event in spacetime.

Click to expand...

Indeed

But, disregarding time, you need 3 dimensions to locate a point in space, or on Earth, or in your living room. That's why all real things have a length, width and height. It is because the world we live in (space) is 3 dimensional (physically).

Just because math books are the place where one tends to hear about dimensions does not mean they're not there under your nose, every moment of the day.

You can demonstrate, to your heart's content, that our universe has exactly three macroscale physical dimensions, and that it does not have two and it does not have four - with nothing but a piece of string.

Why do you think rockets have exactly three sets of maneuvering thrusters (x, y and z)?
Why do you think the rotation of aircraft is described with exactly three parameters (pitch, yaw and roll)?
Why do you think a cardboard box requires exactly three measurements to determine its physical extent and volume (l,w and h)?
Why do you think it takes exactly three coordinates to plot a unique point on Earth? Or anywhere else is space?
In all cases, two is too few, and four is redundant.

These all occur because there are exactly three mutually-independent degrees of freedom in our universe. You can move in any one of the three directions with complete freedom from the other two.

That, by the way, is the definition of a dimension: a degree of freedom.

There is no physical extent of space unless it has all three dimensions. Space cannot exist without them.

Just because math books are the place where one tends to hear about dimensions does not mean they're not there under your nose, every moment of the day.

You can demonstrate, to your heart's content, that our universe has exactly three macroscale physical dimensions, and that it does not have two and it does not have four - with nothing but a piece of string.

Why do you think rockets have exactly three sets of maneuvering thrusters (x, y and z)?
Why do you think the rotation of aircraft is described with exactly three parameters (pitch, yaw and roll)?
Why do you think a cardboard box requires exactly three measurements to determine its physical extent and volume (l,w and h)?
Why do you think it takes exactly three coordinates to plot a unique point on Earth? Or anywhere else is space?
In all cases, two is too few, and four is redundant.

These all occur because there are exactly three mutually-independent degrees of freedom in our universe. You can move in any one of the three directions with complete freedom from the other two.

That, by the way, is the definition of a dimension: a degree of freedom.

There is no physical extent of space unless it has all three dimensions. Space cannot exist without them.

Click to expand...

Yes , to your last statement

All three dimensions of space were naturally apart of space to begin with , mathematics did not create space , just describe space , the nature of space .